Wondersaurus says:
《動手滑滑滑》系列書籍共有四本。分別為顏色、數字、形狀、對比四項學齡前孩子的基本認知主題。每本有10個滑板機關，孩子可以將機關滑過去又滑過來，觀察每個圖像關聯的地方，增進學習的樂趣。
The "Slide and Slide" series consists of four books, focusing on basic cognitive themes for preschool children: colors, numbers, shapes, and contrasts. Each book features 10 sliding mechanisms that allow children to slide back an
